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the western part of the Silesian-Małopolska Upland in southern Poland. The Silesian Upland is a plateau 200 to 300 m high, divided into distinct ridges by river valleys. It is composed primarily of coal-bearing Carboniferous strata overlain by Mesozoic limestones and other sedimentary rocks. It includes a large part of the Upper Silesian coal field. It also has deposits of iron ore, lead-and-zinc ore, rock salt, and sulfur. The Silesian Upland is a highly industrialized region with a high population density. [23–1068–]